--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mobility/hierarchical-mobility-model.h	Thu Jul 19 12:38:30 2007 +0200
@@ -0,0 +1,76 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2007 INRIA
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+#ifndef HIERARCHICAL_MOBILITY_MODEL_H
+#define HIERARCHICAL_MOBILITY_MODEL_H
+
+#include "mobility-model.h"
+
+namespace ns3 {
+
+/**
+ * \brief a hierachical mobility model.
+ * 
+ * This model allows you to specify the position of a
+ * child object relative to a parent object.
+ */
+class HierarchicalMobilityModel : public MobilityModel
+{
+public:
+  static const InterfaceId iid;
+
+  /**
+   * \param child the "relative" mobility model
+   * \param parent the "reference" mobility model
+   */
+  HierarchicalMobilityModel (Ptr<MobilityModel> child, Ptr<MobilityModel> parent);
+
+  /**
+   * \returns the child mobility model.
+   *
+   * This allows you to get access to the position of the child
+   * relative to its parent.
+   */
+  Ptr<MobilityModel> GetChild (void) const;
+  /**
+   * \returns the parent mobility model.
+   *
+   * This allows you to get access to the position of the 
+   * parent mobility model which is used as the reference 
+   * position by the child mobility model.
+   */
+  Ptr<MobilityModel> GetParent (void) const;
+  
+private:
+  virtual Position DoGet (void) const;
+  virtual void DoSet (const Position &position);
+  virtual Speed DoGetSpeed (void) const;
+
+  void ParentChanged (Ptr<const MobilityModel> model);
+  void ChildChanged (Ptr<const MobilityModel> model);
+
+  Ptr<MobilityModel> m_child;
+  Ptr<MobilityModel> m_parent;
+};
+
+
+} // namespace ns3
+
+#endif /* HIERARCHICAL_MOBILITY_MODEL_H */